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Fundamentals of C Programming- MCQ

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Here are the most important Multiple choice questions(MCQ) on the basics of C programming. The MCQs are from the following sections,

  • Introduction to C
  • Data types
  • Variables
  • Constants
  1. Who invented C?
    1. Charles Babbage
    2. Bill Gates
    3. Dennis Ritchie
    4. Steve Jobs
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  1. C is a …………………. type of language?
    1. Procedural
    2. Object-oriented
    3. Functional
    4. Bit-level
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  1. Which of the following is not a valid variable name declaration in C?
    1. int Mark_1;
    2. int mark1;
    3. int __mark1;
    4. int 1mark;
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  1. Find the output of the following C code?
    1. Hello world a
    2. Hello world 0
    3. Hello world followed by a random value
    4. Compile-time error
#include <stdio.h>
int main() {
    printf("Hello world %d", a);
    return 0;
}
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  1. Which of the following is not a valid variable name in C?
    1. mark
    2. number_1
    3. _count
    4. cash_$
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  1. Which of the statement is true for naming variables in C?
    1. Variable names can be made up of alphabets, digits, and special characters.
    2. Variable names can begin with a digit.
    3. White spaces are not allowed in variable names.
    4. Variable names cannot contain the underscore character.
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  1. What will be the output of the following C code?
    1. Hello World 100
    2. Hello World 25
    3. Hello World followed by a random number
    4. Compile-time error
#include <stdio.h>
int main()
{
    int x = 100;
    int x = 25;
    printf("Hello World %d", y);
    return 0;
}
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  1. Which of the following cannot be a variable name in C?
    1. marks_1
    2. teacher
    3. SCORE
    4. for
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  1. Determine the output of the following C code?
    1. 1147
    2. 1185
    3. Run time error
    4. Compile-time error
#include <stdio.h>
    int main()
    {
        int total_Marks = 1185;
        int total_marks = 1147;
        printf("%d", total_marks);
        return 0;
    }
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  1. The format identifier “%d” is used for …………………. datatype?
    1. int
    2. char
    3. long
    4. float
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  1. Which is the correct order of data types with respect to their size?
    1. int > char > float
    2. char > int > float
    3. char < double < int
    4. char < int < double
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  1. Which of the following datatype has varying sizes?
    1. int
    2. double
    3. float
    4. struct
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  1. Which of the following is not a data type in C?
    1. int
    2. real
    3. float
    4. char
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  1. Which of the following statement is true?
    1. ANSI C treats the variable ‘name’ and ‘Name’ to be the same.
    2. Character constants are coded using double-quotes.
    3. All variables must be given a type when they are declared.
    4. Any valid printable ANSII character can be used in an identifier.
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  1. What will be the output of the following C code?
    1. pi is 3.14
    2. Compile-time error
    3. pi is followed by a random value
    4. Run time error
#include <stdio.h>
    int main()
    {
        const float pi;
        pi = 3.14;
        printf("pi is %f", pi);
        return 0;
    }
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  1. A global variable is also known as …………………. variable.
    1. external
    2. internal
    3. static
    4. dynamic
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  1. Which of the following statement is true?
    1. Every line in a C program should end with a semicolon.
    2. Every C program ends with an END word.
    3. Comments cause the computer to print the text enclosed between /* and */ when executed.
    4. A printf statement can generate only one line of output
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  1. Identify the correct output for the following C code?
    1. Compile-time error.
    2. 8
    3. 8.0000000
    4. Garbage value
 #include <stdio.h>
void main()
{
    int a = 8;
    float a = 8;
    printf("%d", a);
}
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  1. Which of the following declaration is not supported in C?
    1. String str;
    2. int a;
    3. float pi=3.14;
    4. char *str;
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  1. If an integer needs two bytes of storage, then the maximum value of an unsigned integer is
    1. 2^{16} - 1
    2. 2^{15} - 1
    3. 2^{16}
    4. 2^{15}
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  1. If an integer needs two bytes of storage, then the maximum value of a signed integer is
    1. 2^{16} - 1
    1. 2^{15} - 1
    1. 2^{16}
    1. 2^{15}
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  1. The statement, printf("%d",printf("hello"));
    1. results in a syntax error
    2. outputs hello5
    3. outputs garbage
    4. prints hello and terminates
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  1. What will be the output of the following fragment of code if the input is abc,
    1. Syntax error
    2. Fatal error
    3. 3
    4. none of the above
#include <stdio.h>
int main() {
    char x, y, z;
    printf ("%d", scanf("%c%c%c", &x, &y, &z ));
    return 0;
}
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  1. Choose the correct statements.
    1. An identifier may start with an underscore
    2. An identifier may end with an underscore
    3. IF is a valid identifier
    4. All of above
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  1. Which of the following are not keywords in C? :
    1. printf
    2. main
    3. IF
    4. All of above
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